26
votes
7answers
5k views

Sizing cells in a GraphicsGrid/GraphicsRow

I would like to add a colour bar to a plot. I tried to use GraphicsRow for this. In a GraphicsRow, each item is given the same ...
5
votes
4answers
579 views

How to repeatedly show variations on a plot

I would like to show graphics repeatedly with changes in parameters. Neither of the following show anything. Nor do they give an error message. ...
14
votes
1answer
857 views

Kernel Management

I would like to run a computation in one NoteBook that will take 2 hours. Could I assign this Notebook a specific Kernel so I can run computation in other Notebooks ?
15
votes
2answers
635 views

Automated testing for compatibility with older Mathematica versions

I have several packages which I actively develop and maintain. I try to stay up to date with new releases of Mathematica and usually update within a couple of months of a new version coming out. As a ...
10
votes
4answers
493 views

How does string interpolation work in Mathematica

I've noticed that Mathematica 8 seems to have some kind of string interpolation feature, but I couldn't find any documentation on it and I can't figure out how it works. For example, if I enter ...
5
votes
1answer
2k views

Simpler way of performing Gaussian Elimination?

Is there a simpler way of performing Gaussian Elimination other than using RowReduce? Such as a single built in function? Edit: Look at the example from our simulation class. Not too difficult, but ...
6
votes
1answer
460 views

How to execute kernel command from Front End?

Documentation for Yuri E. Kandrashkin's OptionsExplorer package says to add the following menu commands in MenuSetup.tr: ...
5
votes
3answers
518 views

Show[] combines my Graphics3D objects in an undesirable way

Thanks to those (Heike, Jens, MrWizard, and R.M.) who helped me yesterday with figuring out how to plot an EM wave. Now I am running into trouble with the Show ...
2
votes
1answer
829 views

A combination of Set::setraw and Set::shape errors

Please consider the following toy code: ...
10
votes
2answers
877 views

Creating a realtime MIDI Out

I have a live stream of notes and note velocities using SoundNote and SoundVolume. My problem is that I have no idea how to ...
3
votes
2answers
481 views

Local variables

I'm trying to use Modules together with functions. tmp2 = x^2 + 1; f[y_] := Module[{x = 1}, Evaluate[y tmp2]] This works when ...
3
votes
1answer
302 views

How do you get Weisstein’s Hyphenate package to run?

I've put Eric Weisstein's Hyphenate.m package in $UserBaseDirectory/Utilities; installed the requisite ...
3
votes
3answers
167 views

Simplifying already defined symbols

Consider the following code: ClearAll[x, y] x = y; y = 2; ?x ?y This will store $x$ being equal to the variable $y$, and $y$ having the value of $2$. Now switch ...
3
votes
1answer
220 views

Avoid crash in recursive Dynamic

With the following Dynamic cell, I can reproducibly crash Mathematica, so do not try this unless you have saved all your work! ...
6
votes
5answers
4k views

Computing eigenvectors and eigenvalues

I have a (non-sparse) $9 \times 9$ matrix and I wish to obtain its eigenvalues and eigenvectors. Of course, the eigenvalues can be quite a pain as we will probably not be able to find the zeros of its ...
17
votes
4answers
1k views

Subplots with connector lines

I am looking for advice from people who have more experience in this area on what is the best (simplest, least effort) way to create a graphic like the following: This is a rough mockup made in a ...
2
votes
1answer
4k views

Visual Studio Express 2010 on x86-64: libcmt.lib missing

The CCompilerDriver documentation explains that to use visual studio express on 64-bit targets, it's necessary to install the windows SDK after installing visual studio. I have done this, first ...
9
votes
1answer
617 views

What is the best way to clip a graphic to a region?

What is the best way to clip a graphic to a certain region? Here's a very simple implementation to show what I mean: ...
6
votes
1answer
457 views

Using physical dimensions in Mathematica DSolve

I would like to calculate a system of two differential equations in Mathematica using DSolve, like: ...
13
votes
4answers
713 views

How to automate a FrontEnd return?

I use some custom shortcut keys in KeyEventTranslations.tr. One is for the Delete All Output function: ...
7
votes
2answers
1k views

Creating Plots for a Family of Solutions

I am wondering how do you set the parameters appropriately for $a_n,\,\alpha,\,\text{and }b_n$ to plot the family of solution of: $u_n(r,t) = [a_n\cos(k_n\alpha t)+b_n\sin(k_n\alpha t)]J_0(k_nr)$ ...
15
votes
1answer
274 views

How to make a function like Set, but with a Block construct for the pattern names

How can we define a function that works like f[x_]=ComputeSomething[x] and treats x as a variable that does not have a value? ...
17
votes
5answers
4k views

How do I plot a plane EM wave?

I would like to display an electromagnetic (EM) wave. I have written code that works, but it does not "shade" the area between the graph and the axes. Both the ...
13
votes
2answers
995 views

Keeping Text Size the Same Throughout Entire Notebook File

Is there a way in which when you choose to format the size of the font within your notebook, for a particular cell, when you go into another cell, the default size font (12pt) will not be ...
0
votes
1answer
362 views

Symbolic Optimisation

I'm trying to solve symbolically the following optimisation: $$ \min_{q_uu}\ \Biggl[ q_u q_{uu}\psi B_{uu} + q_u q_{ud}\psi B_{ud} + q_d q_{du}\psi B_{ud} + q_d q_{dd}\psi B_{dd} $$ $$ + ...
3
votes
3answers
5k views

Product of elements within a list

Please Consider : list={{5,2,6},{2,8,3}} I need to get the product of all the element within list : As of now I do this : ...
22
votes
1answer
990 views

Using .NET 4.0 from NETLink

Using Mathematica 8, I can check the version of the .NET framework used by NETLink as follows: ...
16
votes
2answers
4k views

Delete the current notebook cell using the keyboard

Is there another way than pressing Ctrl+. until the whole cell is selected and then pressing Del? If this is not built in, can I create some sort of a global macro to do this and bind it to a ...
8
votes
1answer
739 views

Hankel Transform integrals won't work in Mathematica

I'm trying to do this integral, which is shown on the Wikipedia page on the Hankel transformation: $$\int_0^{2\pi}\mathrm d\varphi\;e^{\mathrm im\varphi}e^{\mathrm ikr\cos(\varphi)}$$ The answer is ...
39
votes
4answers
6k views

How do I save a variable or function definition to a file?

Is it possible to save a function which was created via Interpolation of some data in such a way that I can use this function in a new Mathematica session without ...
12
votes
2answers
734 views

Is it possible to use the LevenbergMarquardt algorithm for fitting a black-box residual function?

I have a black-box multiargument multiparametric function of the type SRD[dataPoint_List,params_List] which accepts experimental data along with the parameters of ...
114
votes
2answers
5k views

Implementing efficient multiple undo

At the time this question was asked, version 10 was not out yet. The Front End of Mathematica 10 does have multiple undo, see the answer by John Fultz. The Mathematica Front End's built-in Undo ...
24
votes
0answers
524 views

Changing FrontEnd automatic scrolling in version 8

In Mathematica versions < 8, the FrontEnd has a very intelligent behavior: On evaluation, it by default automatically scrolls down the Notebook window to the last printed Output cell but also ...
10
votes
1answer
300 views

How to work around incorrect tooltips in plots exported to HTML

This is an issue that I always wanted to investigate but haven't gotten around to solving yet: The tooltips for contour lines in a plot like this can be very useful in the Notebook interface: ...
5
votes
5answers
2k views

Using implicit differentiation to find a line that is tangent to a curve at a point

A few days ago I asked about using differentiation to find a line that is tangent to a curve at a given point. J.M. provided a very elegant way to solve these kinds of problems in Mathematica. Now ...
11
votes
2answers
273 views

How can you stop ordering of InputField entries?

I have: InputField[Dynamic[d]] Dynamic[d] If I enter e.g. a b x^5 h m the entry automatically gets sorted, as per screen ...
16
votes
2answers
1k views

How can I change the keyboard shortcut for switching the active window?

The default keyboard shortcut (on Windows at least) for switching focus to the next window is Ctrl+F6, and for switching to the previous windows it's Shift+Ctrl+F6. How can I change this to Ctrl+Tab ...
4
votes
1answer
443 views

Get the neighboring vertices and incident edges from a vertex in a graph

I need to get the neighboring vertices and incident edges from a vertex in a graph. I assume NeighborhoodVertices can be used for the former. Anything better? Or ...
3
votes
1answer
907 views

How to write a function to add edges or vertex to a graph

I need to add either a vertex or an edge to a graph, and also sometimes, vertices or edges, or a mixture of the two. How to write a function for this?
16
votes
2answers
772 views

Efficiently collecting results inside a compiled function

When we don't know the number of results that will be generated, the usual way to collect results is Reap/Sow. Another ...
41
votes
8answers
2k views

Injecting a sequence of expressions into a held expression

Consider the following toy example: Hold[{1, 2, x}] /. x -> Sequence[3, 4] It will give Hold[{1, 2, Sequence[3, 4]}] ...
15
votes
3answers
645 views

Measure a DensityHistogram[] pair similarity

I study human vision and more specifically eye-movements. "If we display 2 symmetrical patterns (20 min one after the other), will our gaze distribution be symmetric is my research question." The 2 ...
24
votes
7answers
1k views

How to Derive Tuples Without Replacement

Given a couple of lists like a={1,2,3,4,6} and b={2,3,4,6,9} I can use the built-in Mathematica symbol ...
10
votes
2answers
346 views

Visualizing several long lists of numerical information to see relative frequency

Mathematica has very powerful visualization techniques. However, I'm at a loss at how to best make the following chart readable. ...
14
votes
4answers
1k views

What is the fastest way to locate an image inside a larger image?

let b = let c = How to do: find[c,b] that returns the bounding box of c in b? ...
10
votes
3answers
972 views

Passing down arguments

In R, one can use ... to pass arguments down to another function. For example ...
55
votes
6answers
9k views
15
votes
4answers
6k views

Using FindFit to fit $a\,b^t$: how to avoid introducing complex numbers?

I'd like to find a model $f(t)=a\,b^t$ which matches the following data ...
24
votes
3answers
1k views

Calling IronPython code from Mathematica

I'd like to call some IronPython code from Mathematica using .NET/Link. The problem is that the code lives in .py files, yet from Mathematica I can only load .NET assemblies which are DLLs. So it ...
4
votes
3answers
246 views

Transform vector with lag

Say I have a vector $Z_n$ with and I want to transform it into another vector using this formula: $X_t=Z_t+0.7Z_{t-2}$ The problem is that I am not quite sure how to get that $t-2$ lag in there. I ...

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